CN111756033B

CN111756033B - High-voltage switch device

Info

Publication number: CN111756033B
Application number: CN202010491972.0A
Authority: CN
Inventors: 周驰; 张文亮; 万志辉; 程旎
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2022-08-23
Anticipated expiration: 2040-06-03
Also published as: CN111756033A

Abstract

The present disclosure provides a high voltage switch device, which belongs to the electrical field. High-voltage switchgear: the low-voltage circuit comprises a contactor control circuit, a circuit breaker control circuit and a function control circuit; the contactor control circuit comprises a contactor coil, a first contactor branch and a second contactor branch which are connected in parallel, the first contactor branch and the second contactor branch are respectively connected with the contactor coil in series, a master switch-on button is arranged on the first contactor branch, and a third relay normally-closed contact is arranged on the second contactor branch; the circuit breaker control circuit comprises a circuit breaker coil, a first contactor auxiliary normally open contact and a first circuit breaker branch which are connected in series, wherein the first circuit breaker branch is connected with a first relay normally open contact and a fourth relay normally open contact in series; the high-voltage circuit comprises a first high-voltage branch and a second high-voltage branch which are connected in parallel, and a contactor main normally open contact is arranged on the first high-voltage branch; and a breaker main normally open contact is arranged on the second high-voltage branch.

Description

High-voltage switch device

Technical Field

The present disclosure relates to the electrical field, and more particularly, to a high voltage switching device.

Background

Some electrical equipment requires a higher voltage from the power source, and the power is supplied by sending a high voltage (e.g. 10kV) to a transformer in the machine room through a high voltage cable, and converting the high voltage into the required voltage (e.g. 380kV) through the transformer. During the power supply process, it is important whether the transformer can operate stably and reliably. The transformer is a static electric appliance made according to the principle of electromagnetic induction, is used for changing low voltage into high voltage or changing high voltage into low voltage, and is an important electric device in an alternating current power transmission and distribution system. Due to the saturation of the iron core of the transformer and the existence of residual magnetism, when the transformer is switched on (the high-voltage switch device is switched on to close the conductive loop), the transformer may generate a large current, and the current is an exciting current.

Under the condition of steady-state operation, the exciting current of the transformer is in a safe range, but when the transformer is put into no-load operation or power supply needs to be restored after power failure due to peripheral faults, a large exciting inrush current can occur at the moment of switching-on of the transformer. When the magnetizing inrush current is large, there is a great risk of causing deformation of a winding of the transformer, damage to an electrical component connected to the transformer, and the like, and therefore, it is necessary to suppress generation of the magnetizing inrush current of the transformer.

Disclosure of Invention

The embodiment of the disclosure provides a high-voltage switch device, which can realize pre-excitation of a transformer and switch-on of the transformer after the pre-excitation is completed. The technical scheme is as follows:

the present disclosure provides a high voltage switching device, the high voltage switching device comprising: a contactor, a breaker, a general closing button, a first relay, a third relay, a fourth relay and a low-voltage loop,

the low-voltage loop is connected with a low-voltage mains supply and comprises a contactor control loop, a circuit breaker control loop and a function control loop;

the contactor control circuit comprises a contactor coil, a first contactor branch and a second contactor branch which are connected in parallel, the first contactor branch and the second contactor branch are respectively connected with the contactor coil in series, a general closing button is arranged on the first contactor branch, and a third relay normally-closed contact is arranged on the second contactor branch;

the circuit breaker control circuit comprises a circuit breaker coil, a first contactor auxiliary normally open contact and a first circuit breaker branch which are connected in series, wherein the first circuit breaker branch is connected with a first relay normally open contact and a fourth relay normally open contact in series;

the function control loop comprises a first function branch, a second function branch and a third function branch which are connected in parallel, wherein a second contactor auxiliary normally open contact and a first relay coil are connected in series on the first function branch, a breaker auxiliary normally open contact and a third relay coil are connected in series on the second function branch, a fourth relay coil and a pre-excitation completion signal response switch are connected in series on the third function branch, the first relay coil and the third relay coil are both delay conductive coils, the delay conductive time of the first relay coil is the time spent by pre-excitation of a transformer, and the delay conductive time of the third relay coil is the preset stable time;

the high-voltage switching device further comprises: a high-pressure loop is arranged on the high-pressure loop,

the high-voltage circuit is connected with high voltage, the high-voltage circuit comprises a first high-voltage branch and a second high-voltage branch which are connected in parallel, and a contactor main normally open contact is arranged on the first high-voltage branch; and a breaker main normally open contact is arranged on the second high-voltage branch.

Optionally, the high voltage switchgear further comprises: a second relay, the function control loop further comprising: a fourth functional branch in parallel with the first functional branch,

the fourth function branch is connected with an auxiliary normally open contact of a third contactor, a first relay, a second normally open contact, an auxiliary normally closed contact of a breaker and a second relay coil in series, the second relay coil is a time-delay power-off coil, the time-delay power-off time of the second relay coil is the safety opening time of a preset contactor,

and a second relay normally closed contact is also connected in series on the second contactor branch.

Optionally, the high voltage switchgear further comprises: in-situ mode switching is carried out,

the first contactor branch, the first function branch and the second function branch are respectively connected with the local mode switch in series.

Optionally, the high voltage switchgear further comprises: the remote mode switch is operated in a remote mode,

the contactor control circuit further comprises: with the parallelly connected third contactor branch road of first contactor branch road, it has distant place combined floodgate signal response switch and distant place ready signal response switch to establish ties on the third contactor branch road, the third contactor branch road first function branch road and second function branch road respectively with remote mode switch establishes ties.

Optionally, the high voltage switchgear further comprises: an in-place recloser connected in series with the in-place mode switch,

Optionally, the high voltage switchgear further comprises: a local manual switch, a contactor closing button, a breaker closing button and a contactor opening button,

the in-situ manual switch is connected in series with the in-situ mode switch and in parallel with the in-situ automatic switch;

the contactor control circuit further comprises: a third contactor branch, wherein a contactor closing button is arranged on the third contactor branch, the third contactor branch is connected with the first contactor branch in parallel and is connected with the contactor coil in series,

the circuit breaker control circuit further comprises: the second circuit breaker branch is provided with a circuit breaker closing button and is connected with the first circuit breaker branch in parallel;

the third contactor branch and the second breaker branch are connected in series with the in-situ manual switch,

and the second contactor branch is also provided with a contactor opening button connected with the normally closed contact of the third relay in series.

Optionally, the high voltage switchgear further comprises: the opening button of the circuit breaker is provided with a switch,

the circuit breaker control circuit further comprises: a third circuit breaker branch, be equipped with circuit breaker separating brake button on the third circuit breaker branch, the third circuit breaker branch with the circuit breaker coil is established ties, and with first circuit breaker branch with the supplementary normally open contact series connection circuit of first contactor is parallelly connected.

Optionally, the high voltage switchgear further comprises: a main opening button and a fifth relay,

the function control circuit further includes: a fifth function branch, which is connected in parallel with the fourth function branch, and is provided with a master brake separating button and a fifth relay coil which are connected in series, and is connected in parallel with the first function branch,

a fifth relay-normally closed contact connected with the third relay-normally closed contact in series is further arranged on the second contactor branch;

the circuit breaker control circuit further comprises a fourth circuit breaker branch, the fourth circuit breaker branch is connected with the third circuit breaker branch in parallel, and a fifth relay normally-closed contact is arranged on the fourth circuit breaker branch.

Optionally, the function control circuit further comprises: the remote opening signal responds to the switch,

and the remote brake-separating signal response switch is connected with the master brake-separating button on the fifth functional branch in parallel.

Optionally, the high voltage switchgear further comprises: a sixth relay for controlling the operation of the motor,

the function control circuit further includes: a sixth functional branch in parallel with the fifth functional branch,

the sixth functional branch is connected in series with an emergency opening signal response switch and a sixth relay coil,

and the remote opening signal response switch is also connected with the normally open contact of the sixth relay in parallel.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

the high-voltage switch device comprises a low-voltage loop and a high-voltage loop, the low-voltage loop comprises a contactor control loop, a circuit breaker control loop and a function control loop, the contactor control loop comprises a contactor coil and a master closing button which are connected in series, when the master closing button is pressed, the contactor coil is conducted, the contactor is closed, all normally open contacts of the contactor are closed, namely, an auxiliary normally open contact of a first contactor in the circuit breaker control loop is closed, the closing of an auxiliary normally open contact of a second contactor in the function control loop enables a first relay coil connected in series to be electrified in a delayed mode, the time spent on the pre-excitation of the transformer is delayed to be the time spent on the pre-excitation of the transformer, namely, the first relay coil is electrified after the pre-excitation of the transformer is completed; at the moment, a normally open contact of a first relay in the circuit breaker control loop is closed; meanwhile, after the transformer completes pre-excitation, a pre-excitation completion signal response switch is closed, a fourth relay coil in the function control loop is electrified, a fourth relay normally-open contact in the breaker control loop is closed, and the first contactor is used for assisting in closing the normally-open contact and closing a first relay normally-open contact, so that the breaker coil is conducted, and the breaker is switched on; at the moment, the auxiliary normally open contact of the circuit breaker in the function control circuit is closed, the third relay coil is conducted in a delayed mode, the delayed conduction time is preset stable time, after the circuit breaker is switched on stably, the third relay coil is conducted, the normally closed contact of the third relay in the contactor control circuit is disconnected, and as the total switching-on button is an automatic switching-off button, the contactor coil loses power, the contactor is switched off, and the circuit breaker is used for conducting high-voltage switching control; the pre-excitation of the transformer and the closing of the transformer after the pre-excitation is completed are realized, and the generation of excitation inrush current during the closing of the transformer is inhibited.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a contactor control circuit provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a circuit breaker control circuit provided in an embodiment of the disclosure;

FIG. 3 is a schematic structural diagram of a function control loop provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a high-voltage circuit provided in an embodiment of the present disclosure.

The reference numbers for the various components in the drawings are as follows:

a coil of a KA1 contactor, an auxiliary normally open contact of a KA11 first contactor, an auxiliary normally open contact of a KA12 second contactor, an auxiliary normally open contact of a KA13 third contactor, a main normally open contact of a KA14 contactor, an auxiliary normally open contact of a KA15 fourth contactor,

HA1 general closing button,

KT3 third relay coil, KT31 third relay normally closed contact,

A coil of the KA3 breaker, an auxiliary normally open contact of the KA31 breaker, an auxiliary normally closed contact of the KA32 breaker, a main normally open contact of the KA33 breaker,

A first relay coil of KT1, a first normally open contact of KT11 first relay, a second normally open contact of KT12 first relay,

A KT4 fourth relay coil, a KT41 fourth relay normally open contact,

JC pre-excitation completion signal response switch,

A KT2 second relay coil, a KT21 second relay normally-closed contact,

JJ local mode switch, JJ1 local automatic switch, JJ2 local manual switch,

JY remote mode switch,

A JZ remote closing signal response switch, a JX remote ready signal response switch,

HA2 contactor closing button,

HA3 breaker closing button,

A TA2 contactor opening button,

TA3 breaker opening button,

TA1 master brake-separating button,

A coil of a KT5 fifth relay, a normally closed contact of a KT51 fifth relay, a normally closed contact of a KT52 fifth relay,

JF remote brake-separating signal response switch,

A JK emergency brake-opening signal response switch,

KT6 sixth relay coil, KT61 sixth relay normally open contact,

R current-limiting resistor,

A W temperature controller,

KT7 seventh relay coil,

And D, a fuse.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The terms related to the present embodiment are explained as follows.

High voltage, typically 10kV or more (including 10 kV).

Low voltage is generally referred to as 500V (including 500V) or less.

The loop is a closed circuit formed by the transmission line and the electric element.

A high-voltage switch device is an electric appliance with rated voltage of 1kV or above and is mainly used for switching on and off a conductive loop.

The transformer is a static electric appliance made according to the electromagnetic induction principle, is used for changing low voltage into high voltage or changing high voltage into low voltage, and is an important electric device in an alternating current power transmission and distribution system.

The magnetizing inrush current refers to a large current generated by the transformer when the transformer is switched on (after the current is generated, the current of the transformer will quickly return to a normal no-load current value). The instantaneous peak value of the magnetizing inrush current can be 8-30 times as high as the rated current of the transformer.

A circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and closing, carrying, and opening/closing a current under an abnormal circuit condition within a predetermined time. The circuit breaker comprises a closing coil, a closing operation mechanism and a contact system. The closing of the circuit breaker is realized by converting electric energy into mechanical energy under the electromagnetic action after a closing coil is electrified, so that an armature of the closing coil impacts a closing operating mechanism of the circuit breaker to enable a contact system to act, and the purpose of closing the circuit breaker is achieved. The contact system comprises a main contact and an auxiliary contact, wherein the main contact passes load current for a long time, is switched on after switching on, and is switched off first when switching off; the auxiliary contact and the main contact act simultaneously, and the auxiliary contact is applied to a secondary circuit and indicates the opening and closing state of the main contact.

The contactor is an electric appliance which uses an electromagnetic coil to flow current to generate a magnetic field in industrial electricity so as to close a contact to control a load. The contacts of the contactor also include a main contact and an auxiliary contact. The main contact is used for connecting and disconnecting the main loop to control larger current, and the auxiliary contact is arranged in the control loop to meet the requirements of various control modes. The auxiliary contact and the main contact act simultaneously and are used for indicating the opening and closing state of the main contact. In many cases the main contacts of the circuit breaker are very high in current or voltage and cannot be used directly for monitoring, and must be replaced by auxiliary contacts.

The technical concept of the technical scheme provided by the embodiment is that before the transformer is switched on (a conductive loop is switched on through a high-voltage switching device), a magnetic flux with the same frequency and direction as the magnetic field after the transformer is switched on is established in the transformer, namely, pre-excitation of the transformer is carried out, and the generation of the excitation inrush current of the transformer is inhibited; after pre-excitation, the transformer is switched on through a high-voltage switching device. The pre-excitation mode is as follows: before the transformer is switched on, current is ensured in a primary side winding or a secondary side winding of the transformer, and the frequency and the direction of the current are consistent with those after the transformer is switched on, so that the current can establish a magnetic field consistent with the frequency and the direction after the transformer is switched on.

The disclosed embodiments provide a high voltage switching device capable of completing pre-excitation of a transformer and switching on the transformer after completing the pre-excitation of the transformer. The high-voltage switch device includes: the device comprises a contactor, a circuit breaker, a master closing button, a first relay, a third relay, a fourth relay and a low-voltage loop.

The low-voltage loop is connected with low-voltage mains supply and comprises a contactor control loop, a circuit breaker control loop and a function control loop.

Fig. 1 is a schematic structural diagram of a contactor control circuit provided in an embodiment of the present disclosure. Referring to fig. 1, the contactor control circuit includes a contactor coil KA1 and first and second contactor branches connected in parallel.

First contactor branch road and second contactor branch road are established ties with contactor coil KA1 respectively, are equipped with total closing button HA1 on the first contactor branch road, are equipped with third relay normally closed contact KT31 on the second contactor branch road.

Fig. 2 is a schematic structural diagram of a circuit breaker control circuit provided in an embodiment of the present disclosure. Referring to fig. 2, the circuit breaker control circuit includes, in series, a circuit breaker coil KA3, a first contactor auxiliary normally open contact KA11, and a first circuit breaker branch.

The first breaker branch is connected in series with a first relay-normally open contact KT11 and a fourth relay-normally open contact KT 41.

Fig. 3 is a schematic structural diagram of a function control loop provided in the embodiment of the present disclosure. Referring to fig. 3, the function control loop includes a first function branch, a second function branch, and a third function branch connected in parallel.

The first function branch is connected with a second contactor auxiliary normally open contact KA12 and a first relay coil KT1 in series, the second function circuit is connected with a breaker auxiliary normally open contact KA31 and a third relay coil KT3 in series, and the third function branch is connected with a fourth relay coil KT4 and a pre-excitation completion signal response switch JC in series. The first relay coil KT1 and the third relay coil KT3 are delay conductive coils, the delay conductive time of the first relay coil KT1 is the time spent on pre-excitation of the transformer, and the delay conductive time of the third relay coil KT3 is the preset stable time.

The high-voltage switchgear further comprises: a high pressure loop.

Fig. 4 is a schematic structural diagram of a high-voltage circuit provided in an embodiment of the present disclosure. Referring to fig. 4, a high-voltage loop is connected to high-voltage electricity, the high-voltage loop comprises a first high-voltage branch and a second high-voltage branch which are connected in parallel, and a contactor main normally open contact KA14 is arranged on the first high-voltage branch; and a main normally open contact KA33 of the circuit breaker is arranged on the second high-voltage branch.

In the embodiment of the disclosure, the high-voltage switching device comprises a low-voltage loop and a high-voltage loop, the low-voltage loop comprises a contactor control loop, a circuit breaker control loop and a function control loop, the contactor control loop comprises a contactor coil KA1 and a master closing button HA1 which are connected in series, when the master closing button HA1 is pressed, the contactor coil KA1 is conducted, the contactor is closed, all normally open contacts of the contactor are closed, namely a first contactor auxiliary normally open contact KA11 in the circuit breaker control loop is closed, closing of a second contactor auxiliary normally open contact KA12 in the function control loop enables a first relay coil KT1 connected in series to be powered in a delayed mode, the time spent by delayed power is the time spent by pre-excitation of a transformer, namely after the pre-excitation of the transformer is completed, the first relay coil KT1 is powered; at the moment, a normally open contact of a first relay in a circuit breaker control loop is closed; meanwhile, after the transformer finishes pre-excitation, a pre-excitation finishing signal response switch JC is closed, a fourth relay coil KT4 in a function control loop is electrified, a fourth relay normally-open contact KT41 in a breaker control loop is closed, and in addition, a first contactor auxiliary normally-open contact KA11 is closed and a first relay normally-open contact is closed, so that a breaker coil KA3 is conducted, and a breaker is switched on; at the moment, the auxiliary normally open contact KA31 of the circuit breaker in the function control circuit is closed, the third relay coil KT3 conducts electricity in a delayed mode, the delayed conduction time is preset stable time, after the circuit breaker is switched on stably, the third relay coil KT3 conducts electricity, the normally closed contact KT31 of the third relay in the contactor control circuit is disconnected, the total switching-on button HA1 is an automatic disconnection button, at the moment, the contactor coil KA1 loses electricity, the contactor is switched on, and the circuit breaker conducts high-voltage switch control; the pre-excitation of the transformer and the closing of the transformer after the pre-excitation is completed are realized, and the generation of excitation inrush current during the closing of the transformer is inhibited.

Optionally, the contactor is a vacuum contactor and the circuit breaker is a vacuum circuit breaker.

The pre-excitation completion signal comes from the transformer. The contactor is closed and charges the primary side of the transformer. The transformer can measure whether the primary side has current or not in real time, when the primary side has current and the current is in a target current range, pre-excitation is determined, and a pre-excitation completion signal is sent out after a preset pre-excitation time.

The pre-excitation completion signal response switch JC is an electric control switch, and when the transformer monitors that pre-excitation is completed, the pre-excitation completion signal response switch JC is sent out a pre-excitation completion signal, and the pre-excitation completion signal response switch JC is closed.

Illustratively, the transformer pre-excitation takes 3 seconds. The preset stabilization time is 2 seconds.

Exemplarily, referring to fig. 3, the high voltage switchgear further comprises: the second relay, function control loop still includes: and the fourth functional branch is connected with the first functional branch in parallel.

The auxiliary normally open contact KA13 of third contactor, the two normally open contacts KT12 of first relay, the auxiliary normally closed contact KA32 of circuit breaker and second relay coil KT2 are established ties on the fourth function branch, and the second relay coil is the time delay outage coil, and the time delay outage time of second relay coil is for predetermineeing contactor safety separating brake time.

Correspondingly, referring to fig. 1, a second relay normally-closed contact KT21 is also connected in series on the second contactor branch.

Illustratively, the contactor safety opening time is preset to be 5 seconds.

After the contactor is switched on, the auxiliary normally open contact KA13 of the third contactor is closed, and then the first relay coil is electrified after the transformer pre-excitation is completed, so that the normally open contact of the first relay is closed, and at the moment, the second relay coil is electrified and is subjected to delayed power-off; if after pre-excitation is completed, the breaker is failed to be switched on, the auxiliary normally closed contact KA32 of the breaker is always closed, the second relay coil is powered off after the safety switching-off time of the contactor is preset, so that the normally closed contact KT21 of the second relay is disconnected, the contactor coil is powered off, the contactor is switched off, and safety protection is performed on the contactor and the transformer after the breaker is failed to be switched on.

Exemplarily, referring to fig. 1 and 3, the high voltage switchgear further comprises: a local mode switch JJ.

The first contactor branch, the first function branch and the second function branch are respectively connected with the local mode switch JJ in series.

After the local mode switch JJ is closed, the pre-excitation and closing of the transformer can be controlled one key by the master closing button HA 1.

The in-place mode is suitable for normal operation of the high-voltage switchgear, nearby control of a machine room (provided with a transformer), debugging and troubleshooting scenes of the high-voltage switchgear.

Exemplarily, referring to fig. 1 and 3, the high voltage switchgear further comprises: remote mode switch JY.

The contactor control circuit further comprises: and the third contactor branch, the first function branch and the second function branch are respectively connected with the remote mode switch JY in series.

After the remote mode switch JY is closed and the local mode switch JJ is opened, only after the remote closing signal response switch JZ and the remote ready signal response switch JX are closed, the pre-excitation and closing of the transformer can be automatically controlled.

The remote closing signal comes from electrical equipment on a loop where the high-voltage switching device is located, such as a transformer; the remote ready signal comes from the control computer in the control room. The self-checking system of the transformer performs self-checking on the transformer before the transformer is switched on, and sends a remote switching-on signal when the transformer is determined to be switched on. The staff sends a remote ready signal through the control computer.

The remote closing signal response switch JZ and the remote ready signal response switch JX are both electric control switches and are closed after receiving a remote closing signal and a remote ready signal respectively.

The remote mode is suitable for normal operation of the high-voltage switchgear and a control room (control system where all equipment is installed) remote control scenario.

Exemplarily, referring to fig. 1 and 3, the high voltage switchgear further comprises: the system comprises a local automatic switch JJ1, a contactor closing button HA2, a breaker closing button HA3 and a contactor opening button TA 2.

The local automatic switch JJ1 is connected in series with the local mode switch JJ.

Pre-excitation and closing of the transformer can be controlled by one key of the total closing button HA1 only when the local mode switch JJ is closed and the local automatic switch JJ1 is closed.

The local automatic mode is suitable for normal operation of the high-voltage switchgear and nearby control scenes of a machine room (provided with a transformer).

Exemplarily, referring to fig. 1-3, the high voltage switchgear further comprises: a local manual switch JJ 2.

The in-place manual switch JJ2 is connected in series with the in-place mode switch JJ and in parallel with the in-place automatic switch JJ 1.

Referring to fig. 1, the contactor control circuit further comprises: and a third contactor branch, on which a contactor closing button HA2 is arranged, is connected in parallel with the first contactor branch and is connected in series with a contactor coil KA 1.

Referring to fig. 2, the circuit breaker control circuit further includes: and the second circuit breaker branch circuit is provided with a circuit breaker closing button HA3 and is connected with the first circuit breaker branch circuit in parallel.

The third contactor branch and the second breaker branch are each connected in series with a local manual switch JJ 2.

And the second contactor branch is also provided with a contactor opening button TA2 connected with the normally closed contact KT31 of the third relay in series.

Pre-excitation and closing of the transformer can be manually controlled by the contactor close button HA2, the breaker close button HA3 and the contactor open button TA2 only when the local mode switch JJ is closed and the local manual switch JJ2 is closed.

The in-situ manual mode is suitable for installation debugging and troubleshooting scenarios of the high-voltage switchgear.

Exemplarily, referring to fig. 2, the high voltage switchgear further comprises: breaker separating brake button TA3, breaker control circuit still includes: and a breaker opening button TA3 is arranged on the third breaker branch, the third breaker branch is connected with a breaker coil KA3 in series, and the third breaker branch is connected with the first breaker branch and the first contactor auxiliary normally open contact KA11 series circuit in parallel.

The breaker opening button TA3 is used for opening the breaker.

Exemplarily, referring to fig. 3, the high voltage switchgear further comprises: total separating brake button TA1 and fifth relay, function control circuit still includes: and the fifth function branch is connected with the fourth function branch in parallel, a total opening button TA1 and a fifth relay coil KT5 which are connected in series are arranged on the fifth function branch, and the fifth function branch is connected with the first function branch in parallel.

Correspondingly, a fifth relay-normally closed contact KT51 connected with the third relay-normally closed contact KT31 in series is further arranged on the second contactor branch.

Correspondingly, referring to fig. 2, the circuit breaker control circuit further includes a fourth circuit breaker branch, the fourth circuit breaker branch is connected with the third circuit breaker branch in parallel, and a fifth relay second normally-closed contact KT52 is arranged on the fourth circuit breaker branch.

The total opening button TA1 is used for one-key opening of the circuit breaker and the contactor.

Illustratively, referring to fig. 3, the function control circuit further includes: the remote opening signal responds to the switch JF.

The remote opening signal response switch JF is connected in parallel with the master opening button TA1 on the fifth functional branch.

The remote opening signal comes from the control computer in the control room, and is suitable for the normal operation of the high-voltage switch device. The remote opening signal response switch JF is an electrically controlled switch (remote dry contact) and is closed when a remote opening signal is received.

When the remote opening signal responds to the closing of the switch JF and the total opening button TA1 is not closed, one-key opening of the circuit breaker and the contactor is also realized.

Exemplarily, referring to fig. 3, the high voltage switchgear further comprises: sixth relay, function control circuit still includes: and the sixth functional branch is connected with the fifth functional branch in parallel.

An emergency opening signal response switch JK and a sixth relay coil KT6 are connected in series on the sixth functional branch,

the remote opening signal response switch JF is also connected with a normally open contact KT61 of a sixth relay in parallel.

The emergency brake-separating signal comes from the safety brake-separating in the emergency scene. The emergency brake-separating signal response switch JK is an electric control switch and is closed after receiving the emergency brake-separating signal.

When the emergency opening signal response switch JK is closed, the distant opening signal response switch JF is not closed and the total opening button TA1 is not closed, one-key opening of the circuit breaker and the contactor is realized.

And a fourth contactor auxiliary normally open contact KA15 is further arranged on the second contactor branch, and the second contactor branch is conducted after the KA1 is conducted so as to become a self-locking branch.

Optionally, referring to fig. 4, the high voltage switchgear further comprises: and a current limiting resistor R. And a current-limiting resistor R connected with the auxiliary normally open contact KA13 of the third contactor in series is also arranged on the first high-voltage branch.

Accordingly, referring to fig. 3, the high voltage switchgear further comprises: a temperature controller W and a seventh relay. The function control loop further comprises: and the seventh functional branch is connected with the sixth functional branch in parallel, and a temperature controller W and a seventh relay coil KT7 are connected on the seventh functional branch in series.

The temperature controller W is an infrared temperature controller W and can monitor the working temperature of the current limiting resistor R. When the temperature exceeds the target temperature range, the temperature controller W controls the seventh relay coil KT7 to be electrified. After the seventh relay coil KT7 is electrified, an alarm device is started to give an alarm, and at the moment, any switching-on operation cannot be carried out.

Optionally, referring to fig. 4, the high voltage switchgear further comprises: and a fuse D. And a fuse D connected with the auxiliary normally open contact KA13 of the third contactor in series is further arranged on the first high-voltage branch.

Illustratively, the transmission lines in the first high-voltage branch and the second high-voltage branch are both three-phase high-voltage power.

The operation of the high-voltage switchgear will be briefly described below.

The switching-on sequence realized by the high-voltage switching device is as follows: firstly, closing a contactor, and carrying out high-voltage and pre-excitation on a load through the contactor; closing the contactor for 3 seconds and closing the circuit breaker when receiving an external pre-excitation completion signal; the contactor is automatically disconnected 2 seconds after the breaker is closed, and power is supplied to the load through the breaker; if the breaker is not closed after 8 seconds of contactor closing, the contactor is opened.

There are three control modes for the control of the high voltage switchgear: remote mode, local automatic mode, and local manual mode.

A switching-on function: the remote mode and the local automatic mode are both automatic closing. The local manual mode is manual closing.

In the remote mode, after the high-voltage switching device receives an external ready signal and a closing signal (a remote dry contact is closed, a pulse signal), the coil KA1 is electrified, and the contactor is closed. After the contactor is switched on, at the moment, in fig. 4, a KT1 time delay relay coil is electrified, a contact of KT1 in fig. 2 is closed in a time delay mode of 3s, a pre-excitation completion signal is received in fig. 4, the KT4 is electrified and is disconnected after 8 seconds, a contact of KT4 in fig. 2 is closed, a coil KA3 is electrified, and a breaker is closed. After the breaker is closed, an auxiliary contact KA14 of the breaker in the diagram 4 is closed, a coil KT3 of the third relay is electrified, a contact of KT3 in the diagram 3 is disconnected in a time delay of 2S, the coil KA1 is deenergized, the contactor is switched off, if the contactor is closed for 8S (KT1 is closed in a time delay of 3S and KT2 is closed in a time delay of 5 seconds), the breaker is still not closed, at the moment, contacts KT4 and KT2 are disconnected, and the contactor is switched off.

In the local automatic mode, the switch-on is automatically carried out according to the switch-on sequence after passing through a one-key switch-on button HA1, and an external switch-on signal is invalid.

Under the emergency condition, the device is in a local manual mode, and the closing operation is manually completed. The switching-on process is completed through the buttons of 'contactor switching-on', 'breaker switching-on' and 'contactor switching-off'. In the local manual mode, a contactor closing button HA2 is pressed, a coil KA1 is powered on, the contactor is closed, the pre-magnetizing time (more than or equal to 3s) of the contactor is estimated manually, a breaker closing button HA3 is pressed, a coil KA3 is powered on, the breaker is closed, after 2s are estimated, a contactor opening button TA2 in the graph 3 is pressed, the coil KA1 is powered off, and the contactor is opened.

The opening function: in any mode, the closed contactor and the closed circuit breaker are opened by pressing a one-key opening button (a total opening button TA1), a contactor opening button TA2 and a circuit breaker opening button TA3 or receiving a remote opening command (a remote opening signal or an emergency opening signal).

The opening is not influenced by any mode, namely in any mode, the breaker and the contactor are opened only by pressing opening buttons TA3, TA2 and TA1 and sending a distant opening signal or an emergency opening signal.

Above, the electrical component among this high voltage switchgear includes circuit breaker, contactor, total closing button, first relay, second relay, third relay, fourth relay, fifth relay coil, sixth relay and seventh relay, still includes a plurality of buttons: a general closing button, a contactor closing button, a breaker closing button and the like. Because the loops of the contactor and the circuit breaker are self-locking circuits, the buttons are automatic reset switches, and the automatic reset switches are automatically reset and disconnected after being pressed to be closed. According to the high-voltage switch device, the relay coil and the contact are combined to form the high-voltage switch control loop, so that the safe and intelligent control of the high-voltage switch is realized, the high-voltage switch device is not influenced by an external control module, can normally work under the condition that other control modules are invalid, and the safe reliability of the switching process is ensured to the greatest extent.

The above description is intended only to illustrate the preferred embodiments of the present disclosure, and should not be taken as limiting the disclosure, as any modifications, equivalents, improvements and the like which are within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A high voltage switchgear, characterized in that it comprises: a contactor, a breaker, a general closing button, a first relay, a third relay, a fourth relay and a low-voltage loop,

the contactor control circuit comprises a contactor coil (KA1) and a first contactor branch and a second contactor branch which are connected in parallel, the first contactor branch and the second contactor branch are respectively connected with the contactor coil (KA1) in series, the first contactor branch comprises a total closing button (HA1), and the second contactor branch comprises a third relay normally closed contact (KT 31);

the circuit breaker control loop comprises a circuit breaker coil (KA3), a first contactor auxiliary normally open contact (KA11) and a first circuit breaker branch circuit which are connected in series, wherein the first circuit breaker branch circuit comprises a first relay normally open contact (KT11) and a fourth relay normally open contact (KT41) which are connected in series;

the function control loop comprises a first function branch, a second function branch and a third function branch which are connected in parallel, the first function branch comprises a second contactor auxiliary normally-open contact (KA12) and a first relay coil (KT1) which are connected in series, the second function branch comprises a breaker auxiliary normally-open contact (KA31) and a third relay coil (KT3) which are connected in series, the third function branch comprises a fourth relay coil (KT4) and a pre-excitation completion signal response switch (JC) which are connected in series, the first relay coil (KT1) and the third relay coil (KT3) are delay conductive coils, the delay conductive time of the first relay coil (KT1) is the time spent on transformer pre-excitation, and the delay conductive time of the third relay coil (KT3) is the preset stabilization time;

the high voltage switching device further comprises: a high-pressure loop is arranged on the high-pressure loop,

the high-voltage circuit is connected with high voltage, the high-voltage circuit comprises a first high-voltage branch and a second high-voltage branch which are connected in parallel, and the first high-voltage branch comprises a contactor main normally open contact (KA 14); the second high voltage branch comprises a breaker main normally open contact (KA 33).

2. The high voltage switching device of claim 1, further comprising: a second relay, the function control loop further comprising: a fourth functional branch in parallel with the first functional branch,

the fourth functional branch comprises a third contactor auxiliary normally open contact (KA13), a first relay second normally open contact (KT12), a breaker auxiliary normally closed contact (KA32) and a second relay coil (KT2) which are connected in series, the second relay coil (KT2) is a time-delay power-off coil, the time-delay power-off time of the second relay coil (KT2) is the safety opening time of a preset contactor,

the second contactor branch further comprises a second relay normally closed contact (KT21) connected in series with the third relay normally closed contact (KT 31).

3. The high voltage switching device of claim 2, further comprising: a local mode switch (JJ),

the first contactor branch, the first function branch and the second function branch are respectively connected in series with the local mode switch (JJ).

4. The high voltage switching device of claim 3, further comprising: a remote mode switch (JY),

the contactor control circuit further comprises: and the third contactor branch circuit is connected with the first contactor branch circuit in parallel, a remote closing signal response switch (JZ) and a remote ready signal response switch (JX) are connected on the third contactor branch circuit in series, and the third contactor branch circuit, the first function branch circuit and the second function branch circuit are respectively connected with the remote mode switch (JY) in series.

5. The high voltage switching device of claim 4, further comprising: a local automatic switch (JJ1), the local automatic switch (JJ1) being connected in series with the local mode switch (JJ),

6. The high voltage switching device of claim 5, further comprising: a local manual switch (JJ2), a contactor closing button (HA2), a breaker closing button (HA3) and a contactor opening button (TA2),

the local manual switch (JJ2) is connected in series with the local mode switch (JJ) and in parallel with the local automatic switch (JJ 1);

the contactor control circuit further comprises: a third contactor branch on which a contactor closing button (HA2) is provided, the third contactor branch being connected in parallel with the first contactor branch and in series with the contactor coil (KA1),

the circuit breaker control circuit further comprises: a circuit breaker closing button (HA3) is arranged on the second circuit breaker branch, and the second circuit breaker branch is connected with the first circuit breaker branch in parallel;

the third contactor branch and the second breaker branch are respectively connected in series with the in-situ manual switch (JJ2),

the second contactor branch is also provided with a contactor opening button (TA2) connected with the normally closed contact (KT31) of the third relay in series.

7. The high voltage switching device of claim 6, further comprising: a breaker opening button (TA3),

the circuit breaker control circuit further comprises: a third circuit breaker branch, be equipped with circuit breaker separating brake button (TA3) on the third circuit breaker branch, the third circuit breaker branch with circuit breaker coil (KA3) establishes ties, and with first circuit breaker branch with the supplementary normally open contact of first contactor (KA11) series circuit is parallelly connected.

8. The high voltage switching device of claim 7, further comprising: a total opening button (TA1) and a fifth relay,

the function control circuit further includes: a fifth functional branch connected in parallel with the fourth functional branch, the fifth functional branch comprising a total trip button (TA1) and a fifth relay coil (KT5) connected in series, the fifth functional branch being connected in parallel with the first functional branch,

the second contactor branch also comprises a fifth relay-normally closed contact (KT51) which is connected with the third relay-normally closed contact (KT31) in series;

the circuit breaker control circuit further comprises a fourth circuit breaker branch, the fourth circuit breaker branch is connected with the third circuit breaker branch in parallel, and the fourth circuit breaker branch comprises a fifth relay two normally closed contacts (KT 52).

9. The high voltage switching device of claim 8, wherein the function control circuit further comprises: the remote opening signal responds to a switch (JF),

the remote opening signal response switch (JF) is connected with the total opening button (TA1) on the fifth functional branch in parallel.

10. The high voltage switching device of claim 9, further comprising: a sixth relay for a second relay of the vehicle,

the sixth functional branch comprises an emergency opening signal response switch (JK) and a sixth relay coil (KT6) which are connected in series,

the distant opening signal response switch (JF) is also connected with the normally open contact (KT61) of the sixth relay in parallel.